Break up ShouldDoNothing checks into separate lines, so it's possible to profile them

autoload/ale.vim

@@ -41,14 +41,40 @@ endfunction
 " A function for checking various conditions whereby ALE just shouldn't
 " attempt to do anything, say if particular buffer types are open in Vim.
 function! ale#ShouldDoNothing(buffer) abort
+    " The checks are split into separate if statements to make it possible to
+    " profile each check individually with Vim's profiling tools.
+
     " Do nothing for blacklisted files
-    " OR if ALE is running in the sandbox
+    if index(g:ale_filetype_blacklist, &filetype) >= 0
-    return index(g:ale_filetype_blacklist, &filetype) >= 0
+        return 1
-    \   || (exists('*getcmdwintype') && !empty(getcmdwintype()))
+    endif
-    \   || ale#util#InSandbox()
+
-    \   || !ale#Var(a:buffer, 'enabled')
+    " Do nothing if running from command mode
-    \   || ale#FileTooLarge()
+    if exists('*getcmdwintype') && !empty(getcmdwintype())
-    \   || getbufvar(a:buffer, '&l:statusline') =~# 'CtrlPMode.*funky'
+        return 1
+    endif
+
+    " Do nothing if running in the sandbox
+    if ale#util#InSandbox()
+        return 1
+    endif
+
+    " Do nothing if ALE is disabled.
+    if !ale#Var(a:buffer, 'enabled')
+        return 1
+    endif
+
+    " Do nothing if the file is too large.
+    if ale#FileTooLarge()
+        return 1
+    endif
+
+    " Do nothing from CtrlP buffers with CtrlP-funky.
+    if getbufvar(a:buffer, '&l:statusline') =~# 'CtrlPMode.*funky'
+        return 1
+    endif
+
+    return 0
 endfunction
 
 " (delay, [linting_flag, buffer_number])